What's the difference between => , ()=>, and Unit=>

Question

I\'m trying to represent a function that takes no arguments and returns no value (I\'m simulating the setTimeout function in JavaScript, if you must know.)

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Answer 1

I do it this way (just don't want to break apply):

case class Thing[A](..., lazy: () => A) {}
object Thing {
  def of[A](..., a: => A): Thing[A] = Thing(..., () => a)
}

and call it

Thing.of(..., your_value)